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The forming wire in papermaking is too important! Has this been covered in textbooks?

2026-03-17 13:55:49

The forming wire in papermaking is too important! Has this been covered in textbooks?

 

The dewatering wire (also known as the forming wire) is a critical and expensive consumable component on paper machines. Its proper use directly affects paper quality, production efficiency, and operating costs. Below are detailed usage guidelines covering installation, operation, and maintenance.

 

I. Installation Precautions (Top Priority)

 

1. Unboxing Inspection:

- Carefully open the package using a box-opening tool; avoid sharp instruments like knives that could damage the wire.

- Verify information: Check that the wires model and specifications (length, width, circumference) match the order and machine requirements.

- Visual inspection: Examine the surface carefully for obvious manufacturing defects, damage, stains, or creases.

 

2. Installation Environment:

- Clean workspace: Ensure the installation area is clean and free of debris such as hard objects or welding slag to prevent punctures or abrasion of the wire.

- Adequate space: Prepare sufficient room to lay out and hoist the wire safely.

 

3. Installation Procedures:

- Proper hoisting: Use wide, soft slings (never steel cables). Lift evenly to avoid excessive localized stress that could deform or damage the wire.

- Smooth unfolding: Lay the wire flat on the ground or a dedicated support frame to allow natural expansionavoid forcibly pulling or twisting it.

- Confirm direction: Pay attention to directional markings (usually arrows) on the wire to ensure correct installation orientation.

- Team coordination: Use multiple personnel with unified command to slowly and smoothly thread the wire onto the machine. Ensure it passes smoothly through all rollers, suction boxes, etc., without any scraping or collision.

- Use guide rollers properly: Correctly apply guide rollers to prevent misalignment and damage.

 

II. Operation & Commissioning Precautions

 

1. Initial Tensioning:

- Low-speed tensioning: Start the machine at low speed (e.g., crawling speed), then gradually and evenly tighten the wire.

- Avoid over-tensioning: Initial tension should not be too highfollow manufacturer recommendations from either equipment supplier or wire provider. Excessive tension shortens lifespan and increases operational load.

 

2. Misalignment Control:

- Timely correction: During low-speed operation, closely monitor the wires path; use adjusting rollers for fine-tuning so that it runs stably centered.

- Avoid abrupt adjustments: Adjust guide rollers slowly and slightlysudden changes may cause wrinkles in the wire.

 

3. Uniform Dewatering:

- Vacuum control: Gradually increase vacuum levels in suction boxes from low to high to ensure even dewatering and avoid localized severe wear on the mesh surface.

- Inspect dewatering components: Ensure table boards and vacuum box panels are flat and smooth with no wear marks or grooves.

 

III. Normal Operation & Maintenance Precautions

 

1. Washing & Cleaning:

- High-pressure rinsing: Regularly use high-pressure water to effectively clean both sides of the wirethe side contacting pulp (contact surface) and that contacting dewatering elements (running surface)to remove fibers, fillers, and adhesives clogging mesh openings.

- Optimize pressure & angle: Adjust spray nozzle angle and pressure appropriately for optimal cleaning without damaging the mesh.

- Periodic chemical cleaning: Perform online or offline chemical cleaning regularly to dissolve sticky substances not removable by water alone.

 

2. Tension Control:

- Maintain proper tension: Operate at minimal necessary working tension while meeting process requirements. Excessive tension is a primary cause of premature fatigue failure.

 

3. Prevent Mechanical Damage:

- Prevent material entanglement: Promptly remove foreign objects from pulp feed to avoid them getting trapped between wires and rollerscausing web lifting or tearing.

- Equipment maintenance: Regularly inspect all components contacting wiresincluding vacuum box panels, table boards, rollers (especially press rolls and drive wires), ensuring their surfaces are smooth without burrs, cracks, or adhesions.

- Shutdown procedures: During planned shutdowns, release tension from wires; maintain low-speed rotation or periodically turn them manually to prevent permanent deformation caused by prolonged static pressure at one point. For long-term shutdowns, remove wires after cleaning them thoroughly for safe storage.

 

4. Process Control:

- Pulp quality assurance: Maintain good screening quality of pulp feedstockminimize impurities.

- Chemical dosing control: Monitor addition of fillers and chemicals (e.g., defoamers, preservatives) carefullyavoid formation of sticky deposits that clog mesh openings.

 

IV. Common Issues & Prevention

 

Wrinkling Often caused by uneven tension distribution, improper alignment adjustment, nonparallel rollers, or localized wear; address promptly after identifying root causes.

Wear Inspect all contact surfaces regularly; ensure they remain smooth without defects.

Clogging Improve rinsing routines; enhance pulp preparation system performance as well as chemical management systems.

Longitudinal tearing Stop machine immediately upon detection; locate and remove hard objects caught inside; repair underlying equipment issues.

 

Following these precautions will maximize dewatering wire performance, significantly extend its service lifeand ultimately reduce production costs while ensuring stable paper quality.


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